Sonic Riders: Zero Gravity

It is the fifth racing game in the Sonic the Hedgehog series, following Sonic Drift, Sonic Drift 2, Sonic R and its predecessor, Sonic Riders. Although the stories start separately, they overlap each other, telling the story as the main characters within that story see it. Along the way they discover surprises, including the return of the Babylon Rogues, a group of avian thieves who are also after the artifacts. Toward the end of the Heroes story, Sonic and friends discover that Eggman had created the robots, but they had gone berserk due to a malfunction. However, due to a distortion, as the Babylon city begins to float into the sky, the artifacts power becomes corrupted and opens up a black hole which could vacuum in the whole world. As Sonic and the gang travel back to the city, they marvel over the artifacts and Babylon Garden's true origins: they originated from another planet unlike Earth.